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From: "Dermot Paikkos" <dermotsciencephoto.com>
To: magick-usersimagemagick.org
Date: Wed, 22 Mar 2006 09:57:16 -0000
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Subject: [magick-users] extraneous bytes error - one
possible fix
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Content preview: Hi, This post started as a request for
help but has
ended up as a FYI post. I have quite a few jpegs with
"extraneous bytes
before marker 0xed". [...]
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Hi,
This post started as a request for help but has ended up as
a FYI
post.
I have quite a few jpegs with "extraneous bytes before
marker 0xed".
The images can be opened in PS, IrfanView and browsers so
the
corruption is not fatal but, mostly as an exercise, I wanted
to try
and remove the error.
I could convert the files to remove the error but that would
apply
the encoding again and would lead to some, albeit minute,
degradation of the image.
What I wanted was to do is open the files in a hex editor,
find the
marker, delete x number of bytes before the marker and save
the
image.
Trying to find the hex value was a little tough. After doing
a lot of
searching for 'ed' in Hex edit mode of WinVi32, the most
obvious
candidate looks like a section that reads like
00 00 00 00 ff ed 7d
Where 00 goes back about 30 lines. So the marker sequence to
find was
"ff ed 7d". In the 3 cases I looked at the
extraneous bytes were null
or 00.
So to remove the extra bytes, highlight the first null
characters
prior to 'ff ed' back to the first occurrence of 00 in that
sequence.
Delete the highlighted section, save the file with a new
name. Open
it in a graphics package and run identify to check that the
image is
sane. If your happy, overwrite original corrupted file with
your new
version.
The only real benefit I have found in doing this is that
graphics
packages (namely PS) will open the file a little quicker. As
far as I
can tell this process has not tampered with any of the other
file
attributes such as ICC/IPTC/EXIF profiles and the preview
image
remains intact.
Away, HTH.
Dp.
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